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2022 International Conference on Diagnostics in Electrical Engineering (Diagnostika)最新文献

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The Effect of High Concentrations of MgO on Space Charge Accumulation and Electric Field Distribution in Epoxy Resin 高浓度氧化镁对环氧树脂中空间电荷积累和电场分布的影响
2022 International Conference on Diagnostics in Electrical Engineering (Diagnostika) Pub Date : 2022-09-06 DOI: 10.1109/Diagnostika55131.2022.9905134
Jiří Kopřiva, J. Hornak, P. Trnka, O. Michal, Š. Hardoň
{"title":"The Effect of High Concentrations of MgO on Space Charge Accumulation and Electric Field Distribution in Epoxy Resin","authors":"Jiří Kopřiva, J. Hornak, P. Trnka, O. Michal, Š. Hardoň","doi":"10.1109/Diagnostika55131.2022.9905134","DOIUrl":"https://doi.org/10.1109/Diagnostika55131.2022.9905134","url":null,"abstract":"Dielectric materials are an essential part of any electrical device. These materials are under constant development to optimize and improve their insulating properties and adjust them for specific applications. The recent trend of nanocomposites opens new possibilities for these materials via new kinds of modifications not possible in the past. Furthermore, with the increasing trend of HVDC applications, it is of rising importance to further study the effects of DC voltage stress on dielectric materials, as the phenomenon of space charge accumulation has a considerable impact on the longevity of the dielectric system. In this article, a cold-cure epoxy resin was used as a base material and MgO nanoparticles were incorporated in various weight percentages (0, 10, 20, and 30 wt.% of MgO) to create samples. The electric field distribution and space charge accumulation under a high voltage DC stress were measured via the pulse electro-acoustic (PEA) method.","PeriodicalId":374245,"journal":{"name":"2022 International Conference on Diagnostics in Electrical Engineering (Diagnostika)","volume":"538 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124523212","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Diagnostika 2022 Blank Page 诊断卡2022空白页
2022 International Conference on Diagnostics in Electrical Engineering (Diagnostika) Pub Date : 2022-09-06 DOI: 10.1109/diagnostika55131.2022.9905189
{"title":"Diagnostika 2022 Blank Page","authors":"","doi":"10.1109/diagnostika55131.2022.9905189","DOIUrl":"https://doi.org/10.1109/diagnostika55131.2022.9905189","url":null,"abstract":"","PeriodicalId":374245,"journal":{"name":"2022 International Conference on Diagnostics in Electrical Engineering (Diagnostika)","volume":"110 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122712478","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Application of SFRA method for evaluation of short-circuit tests of power transformers SFRA方法在电力变压器短路试验评定中的应用
2022 International Conference on Diagnostics in Electrical Engineering (Diagnostika) Pub Date : 2022-09-06 DOI: 10.1109/Diagnostika55131.2022.9905115
Awad Almehdhar, R. Procházka, M. Vanis
{"title":"Application of SFRA method for evaluation of short-circuit tests of power transformers","authors":"Awad Almehdhar, R. Procházka, M. Vanis","doi":"10.1109/Diagnostika55131.2022.9905115","DOIUrl":"https://doi.org/10.1109/Diagnostika55131.2022.9905115","url":null,"abstract":"Short-circuit tests are among the standard tests of power transformers. Stressing of transformer winding with large short-circuit currents creates a force action that the transformer must withstand up to some limits. During these kind of tests, the mechanical condition of the transformer winding is usually diagnosed by measuring the short-circuit winding reactance. Recently, the SFRA method has been increasingly used for this purpose. The SFRA methods are based on comparing the transmission characteristics of power transformers before and after the test. The paper is focused on the research of possible use of SFRA methods in short circuit tests. Different methods of evaluation of measured transfer characteristics on real power transformers are compared. As a result, the sensitivity of the method to winding deformations and the possibility of early fault prediction during short-circuit tests are assessed. Early prediction of a possible fault is important for the safe conduct of the test without damage to the test equipment.","PeriodicalId":374245,"journal":{"name":"2022 International Conference on Diagnostics in Electrical Engineering (Diagnostika)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130368830","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Measurement systems analysis for the determination of volume resistivity and polarisation indexes 体积电阻率和极化指数测定的测量系统分析
2022 International Conference on Diagnostics in Electrical Engineering (Diagnostika) Pub Date : 2022-09-06 DOI: 10.1109/Diagnostika55131.2022.9905166
P. Prosr, P. Netolický, O. Tůmová, L. Kupka
{"title":"Measurement systems analysis for the determination of volume resistivity and polarisation indexes","authors":"P. Prosr, P. Netolický, O. Tůmová, L. Kupka","doi":"10.1109/Diagnostika55131.2022.9905166","DOIUrl":"https://doi.org/10.1109/Diagnostika55131.2022.9905166","url":null,"abstract":"Volume resistivity is one of basic material properties determined for electrical insulating materials. In many cases, the measurement process can affect the accuracy of the measured data. Therefore, this paper analyzes the measurement process while measuring this parameter. A necessary step to perform the analysis is the analysis of the variability that may arise in the whole measurement process. A controlled experiment is then designed to investigate the factors assumed to influence the measurement result based on this analysis. This controlled experiment is followed by experiment evaluation, results analysis, and a suggestion of possible process or organizational changes that can be made to the measurement system to improve the monitoring of material properties using this diagnostic method. The tests performed showed an expected result: the shorting book and the electrostatic bracelet affect the measured value of the volume resistivity but every parameter to a different degree.","PeriodicalId":374245,"journal":{"name":"2022 International Conference on Diagnostics in Electrical Engineering (Diagnostika)","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116334377","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Verification of quality rotor cages by Electromagnetic Field 用电磁场验证转子保持架的质量
2022 International Conference on Diagnostics in Electrical Engineering (Diagnostika) Pub Date : 2022-09-06 DOI: 10.1109/Diagnostika55131.2022.9905188
P. Pečínka, S. Kocman, O. Orság, V. Pečínková
{"title":"Verification of quality rotor cages by Electromagnetic Field","authors":"P. Pečínka, S. Kocman, O. Orság, V. Pečínková","doi":"10.1109/Diagnostika55131.2022.9905188","DOIUrl":"https://doi.org/10.1109/Diagnostika55131.2022.9905188","url":null,"abstract":"The paper focuses on the creation of a simulation model, describing a diagnostic method for determining the casting quality of the rotor cage of an induction motor with a squirrel rotor cage. The principles of the electromagnetic field are used for diagnostics. The simulation itself is performed in Ansys Maxwell software. In case of interruption or non-casting of the rotor bar during production to lead increase the impedance of the rotor bar and thus lead to decrease the current in the bar. This results in an unbalanced rotor field, which leads to a change in torque by one rotor revolution. The article primarily builds a model of an induction motor in 2D, with damaged rotor bars. The effect of the damage is then examined by a device that senses the induced voltage. This is then further investigated. In the future, the practical compilation of diagnostic methods is also being considered, which will be addressed in connection with a successfully tested model. Due to the fact that a method has not been yet developed that reliably detects failures of rotor bars, this paper was created.","PeriodicalId":374245,"journal":{"name":"2022 International Conference on Diagnostics in Electrical Engineering (Diagnostika)","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114858309","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Interface and data aggregation for modeling electric power systems with sector coupling technologies 基于扇区耦合技术的电力系统建模接口与数据聚合
2022 International Conference on Diagnostics in Electrical Engineering (Diagnostika) Pub Date : 2022-09-06 DOI: 10.1109/Diagnostika55131.2022.9905226
Sebastian Bottler, T. Blenk, C. Weindl
{"title":"Interface and data aggregation for modeling electric power systems with sector coupling technologies","authors":"Sebastian Bottler, T. Blenk, C. Weindl","doi":"10.1109/Diagnostika55131.2022.9905226","DOIUrl":"https://doi.org/10.1109/Diagnostika55131.2022.9905226","url":null,"abstract":"This paper explains the interface and data aggregation methods used for modeling electrical power grids featuring sector coupling technologies within the realm of the state-space-representation. It outlines the creation of node-specific load profiles in medium voltage distribution networks, which integrate the power contribution of sector coupling technologies. Additionally, an approach of modeling mixed-type cable routes is presented, which aims to minimize the system-matrices’ size, thus reducing the computational requirements of the load flow calculation.","PeriodicalId":374245,"journal":{"name":"2022 International Conference on Diagnostics in Electrical Engineering (Diagnostika)","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130906030","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Comparison of One-Dimensional and Two-Dimensional Reference Signal Representation for Insulation Aging State Recognition 一维和二维参考信号在绝缘老化状态识别中的比较
2022 International Conference on Diagnostics in Electrical Engineering (Diagnostika) Pub Date : 2022-09-06 DOI: 10.1109/Diagnostika55131.2022.9905173
Mikhail Olkhovskiy, E. Müllerová, P. Martínek
{"title":"Comparison of One-Dimensional and Two-Dimensional Reference Signal Representation for Insulation Aging State Recognition","authors":"Mikhail Olkhovskiy, E. Müllerová, P. Martínek","doi":"10.1109/Diagnostika55131.2022.9905173","DOIUrl":"https://doi.org/10.1109/Diagnostika55131.2022.9905173","url":null,"abstract":"This paper compares the performance of one-dimensional and two-dimensional convolutional neural networks in the task of analyzing a reference signal while determining the degradation level of single-core polymer-insulated cable. In this work was designed the set of reference signals and several forms of representing of these signals in the form of one-dimensional and two-dimensional tensors. Then, an experimental determination of the most effective version of the reference signal is carried out in terms of classification accuracy and the most effective form of representation of this signal was found, as well as most efficient type of neural network.","PeriodicalId":374245,"journal":{"name":"2022 International Conference on Diagnostics in Electrical Engineering (Diagnostika)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129751515","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Partial discharges analysis of electrical machine winding in low pressure enviroment 低压环境下电机绕组局部放电分析
2022 International Conference on Diagnostics in Electrical Engineering (Diagnostika) Pub Date : 2022-09-06 DOI: 10.1109/Diagnostika55131.2022.9905087
J. Fulneček, Ondřej Kabot, Pavel Kedroň
{"title":"Partial discharges analysis of electrical machine winding in low pressure enviroment","authors":"J. Fulneček, Ondřej Kabot, Pavel Kedroň","doi":"10.1109/Diagnostika55131.2022.9905087","DOIUrl":"https://doi.org/10.1109/Diagnostika55131.2022.9905087","url":null,"abstract":"Breakdown voltage of gas insulation depends on its pressure as is described by Paschen’s curve. Therefore, usage of various electrical devices at high altitudes can lead to insulation breakdown if it is not properly designed for this environment. The accompanying phenomenon of imminent insulation breakdown is presence of partial discharges. This paper describes influence of air pressure and temperature on partial discharge activity. The monitored parameters were inception voltage, number, and amplitude of pulses at constant voltage at various air pressures and temperatures. Measurements were conducted on stator winding of electrical machine in vacuum chamber specially designed for high voltage measurements.","PeriodicalId":374245,"journal":{"name":"2022 International Conference on Diagnostics in Electrical Engineering (Diagnostika)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130505490","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Measurement of low AC currents by the standard current probe equipped with lock-in amplifier 用装有锁相放大器的标准电流探头测量低交流电流
2022 International Conference on Diagnostics in Electrical Engineering (Diagnostika) Pub Date : 2022-09-06 DOI: 10.1109/Diagnostika55131.2022.9905091
J. Svarny
{"title":"Measurement of low AC currents by the standard current probe equipped with lock-in amplifier","authors":"J. Svarny","doi":"10.1109/Diagnostika55131.2022.9905091","DOIUrl":"https://doi.org/10.1109/Diagnostika55131.2022.9905091","url":null,"abstract":"Most of standard current probes are intended for the measurement of medium or higher currents. Usually, due to limited dynamic range, characteristic sensitivity and inner noise of the probe, it is hardly possible to measure currents lower than 100 mA. The paper deals with the possibility to extend the dynamic range of the current probe by an additional external lock-in amplifier. The paper describes the principle of the lock-in amplifier in general and design of the laboratory fixture of lock-in amplifier based on AD630 circuit as well. The designed amplifier was used to condition the output of the Agilentll46A current probe. The experiment is described in detail. The results show that thanks to the lockin amplifier the currents even lower than 1 mA can be easily detected.","PeriodicalId":374245,"journal":{"name":"2022 International Conference on Diagnostics in Electrical Engineering (Diagnostika)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121573254","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Preparation and Testing of Biodegradable Nanofluids 生物可降解纳米流体的制备与测试
2022 International Conference on Diagnostics in Electrical Engineering (Diagnostika) Pub Date : 2022-09-06 DOI: 10.1109/Diagnostika55131.2022.9905076
P. Trnka, Zdislava Mokrá, Jan Leffler, V. Mentlík, O. Michal, J. Hornak
{"title":"Preparation and Testing of Biodegradable Nanofluids","authors":"P. Trnka, Zdislava Mokrá, Jan Leffler, V. Mentlík, O. Michal, J. Hornak","doi":"10.1109/Diagnostika55131.2022.9905076","DOIUrl":"https://doi.org/10.1109/Diagnostika55131.2022.9905076","url":null,"abstract":"Inseparable part of the high voltage transformers is electro insulating liquid. As known, for one hundred years are used mainly mineral oil based insulating fluids since having good electrical and physical properties and being relatively cheap. Over the years other liquids has been considered/used as replacement to mineral oils such as polyfluorobiphenyls (PFB), poly-chlorobiphenyls (PCB), silicones, synthetic esters, gas to liquid (GTL), etc. This paper and research is dealing with testing of modern biodegradable and sustainable oil Envitrafol and its improvements by nanoparticles. As known natural ester-based electro insulating fluids are polar substances with relatively high viscosity and corresponding properties. This paper is focusing on the study of the impact of the modification of natural ester-based fluid by nanoparticles on breakdown voltage (BDV).","PeriodicalId":374245,"journal":{"name":"2022 International Conference on Diagnostics in Electrical Engineering (Diagnostika)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117258112","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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